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Today's Topics:
1. Re: Write operation and Serialization of results
(Damyan Ognyanoff)
2. Re: Problem getting the direct type of an instance
(Damyan Ognyanoff)
3. Re: directsubclass bug? (Damyan Ognyanoff)
----------------------------------------------------------------------
Message: 1
Date: Wed, 16 Sep 2009 17:34:20 +0300
From: "Damyan Ognyanoff" <dam...@sirma.bg>
Subject: Re: [Owlim-discussion] Write operation and Serialization of
results
To: "Laurent PELLEGRINO" <laurent.pellegr...@sophia.inria.fr>,
<owlim-discussion@ontotext.com>
Message-ID: <949e17c299d34c9bb4235f2ef647d...@sirma.int>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=response
Hi Laurent,
couldn't reproduce your first exception - is it possible to isolate
it to a
small example code so to be able to fix it ..
about your second issue related to serialization - I've fixed it and a
distribution is available at http://www.ontotext.come/owlim the new
version
is SwiftOWLIM v3.0.11:
http://www.ontotext.com/owlim/swiftowlim-3.0.beta11-sesame-2.0.zip
apart from the above fix it also improves the directType,
directSubClassOf
and directSubPropertyOf handling so that these consider also the
equivalent
classes and subClass(Property)Of reflexivity correctly
regards,
Damyan
----- Original Message -----
From: "Laurent PELLEGRINO" <laurent.pellegr...@sophia.inria.fr>
To: <owlim-discussion@ontotext.com>
Sent: Monday, September 14, 2009 12:38 PM
Subject: [Owlim-discussion] Write operation and Serialization of
results
Dear all,
I have a problem with write operation on an OWLIM repository.
I can perform a query operation but when I try to perform a write
operation I get the following exception :
[ERROR exceptions.one_way] java.lang.RuntimeException: Connection is
closed
java.lang.RuntimeException: Connection is closed
at com.ontotext.trree.SailConnectionImpl.addStatement(Unknown
Source)
at
org.openrdf.repository.sail.SailRepositoryConnection.addWithoutCommit
(SailRepositoryConnection.java:228)
at
org.openrdf.repository.base.RepositoryConnectionBase.addWithoutCommit
(RepositoryConnectionBase.java:549)
at org.openrdf.repository.base.RepositoryConnectionBase.add
(RepositoryConnectionBase.java:449)
at
eu.soa4all.dsb.space.proactive.datastorage.rdf.owlim.OWLIMStorage.write
(OWLIMStorage.java:88)
My write method is the following :
public void write(Statement stmt) {
RepositoryConnection conn = null;
try {
conn = this.repository.getConnection();
System.out.println("isOpen=" + conn.isOpen());
conn.add(stmt, new URIImpl(spaceURI.toString()));
} catch (RepositoryException e) {
e.printStackTrace();
} finally {
try {
conn.close();
} catch (RepositoryException e) {
e.printStackTrace();
}
}
}
The sysout return isOpen=true.
Does someone has an idea of the problem ?
My second problem is about Serialization. I am retrieving
Statements from
an OWLIM repository. I put each Statement in a Set and i transmit
this
Set to another JVM on an another machine. Objects need to be
Serializable
and it seems that Statement are not Serializable.
I am cheating by using this kind of method :
for (Statement stmt : mySet) {
newSet.add(new StatementImpl(new URIImpl(stmt.getSubject
().stringValue()), new URIImpl(
stmt.getPredicate().stringValue()), new BNodeImpl
(stmt.getObject()
.stringValue())));
}
The problem is that I am not sure that new BNodeImpl(stmt.getObject
().stringValue())) will be the same that stmt.getObject. Is it
right ?
I will have the same problem with TupleQueryResult. How to Serialize
these two kinds of results ?
Thanks.
Kind Regards
Laurent PELLEGRINO
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------------------------------
Message: 2
Date: Wed, 16 Sep 2009 17:40:54 +0300
From: "Damyan Ognyanoff" <dam...@sirma.bg>
Subject: Re: [Owlim-discussion] Problem getting the direct type of an
instance
To: "Stefan Nesbigall" <stefan.nesbig...@dfki.de>,
<owlim-discussion@ontotext.com>
Message-ID: <8cf91738fee046c78320d1f472974...@sirma.int>
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=original
Hi Stefan,
it is very strange to observe such behavior - in swiftowlim we do
not use
external engine to evaluate queries and all triple pattern requests
are
handled through getStatements() so there is no reason to get different
results from query evaluation and by simply invoking getStataments()
- these
are routed to one and the same piece of code - Could you check your
code
related to enumeration of query results - there is a possibility to
somehow
silently fetch and ignore the first result ...
regards,
Damyan
----- Original Message -----
From: "Stefan Nesbigall" <stefan.nesbig...@dfki.de>
To: <owlim-discussion@ontotext.com>
Sent: Tuesday, September 08, 2009 1:21 PM
Subject: [Owlim-discussion] Problem getting the direct type of an
instance
Hi every one
I have little problem since owlim does not find the direct type of
instances.
Somewhere in my ontology I have the following instance defined:
<messemodul:button rdf:about="#RedButton"/>
My OWLIM system does is able to load the ontology into the triple
store.
By this
RepositoryResult<Statement> iter =
repositoryConn.getStatements("http://134.96.184.229/isreal/messemodul_abox.owl#RedButton
",
null, null, true);
I get several triple including
(http://134.96.184.229/isreal/messemodul_abox.owl#RedButton,
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
http://134.96.184.229/isreal/messemodul.owl#button)
(http://134.96.184.229/isreal/messemodul_abox.owl#RedButton,
http://www.w3.org/1999/02/22-rdf-syntax-ns#type,
http://www.w3.org/2002/07/owl#Thing)
But when I use this sparql query:
SELECT ?pred ?obj WHERE {
<http://134.96.184.229/isreal/messemodul_abox.owl#RedButton>?pred ?
obj .
}
I do not get the first triple saying that RedButton is a button. I
just
get all the other triples.
Using a ask query:
ASK { <http://134.96.184.229/isreal/messemodul_abox.owl#RedButton>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://134.96.184.229/isreal/messemodul.owl#button> . }
I get true.
Can anyone help?
Best regards
Stefan
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------------------------------
Message: 3
Date: Wed, 16 Sep 2009 17:45:17 +0300
From: "Damyan Ognyanoff" <dam...@sirma.bg>
Subject: Re: [Owlim-discussion] directsubclass bug?
To: "Armando Stellato" <stell...@info.uniroma2.it>,
<owlim-discussion@ontotext.com>
Message-ID: <080c825386aa4d429b26c2727475c...@sirma.int>
Content-Type: text/plain; charset="iso-8859-1"
Hi Armando,
I've fixed the handling of directType/SubClassOf/SubPropertyOf
predicates so to consider owl:equivalentClass and
owl:equivalenProperty while performing the task (also the
reflexivity of both is considered) so your queries should be much
simpler and run just fine using only the system predicates
let me k now if you experience eny issues with that feature
the new distibution could be downloaded from our site:
SwiftOWLIM v3.0.11:
http://www.ontotext.com/owlim/swiftowlim-3.0.beta11-sesame-2.0.zip
HTH,
Damyan
----- Original Message -----
From: Armando Stellato
To: owlim-discussion@ontotext.com
Sent: Saturday, September 05, 2009 7:37 PM
Subject: Re: [Owlim-discussion] directsubclass bug?
.ops, I forgot to mention my configuration:
Owlim 3 beta 10
This is the config in the owlim.ttl file:
#
# Sesame configuration template for a owlim repository
#
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix rep: <http://www.openrdf.org/config/repository#>.
@prefix sr: <http://www.openrdf.org/config/repository/sail#>.
@prefix sail: <http://www.openrdf.org/config/sail#>.
@prefix owlim: <http://www.ontotext.com/trree/owlim#>.
[] a rep:Repository ;
rep:repositoryID "odnamarExample" ;
rdfs:label "Odnamar Example" ;
rep:repositoryImpl [
rep:repositoryType "openrdf:SailRepository" ;
sr:sailImpl [
sail:sailType "swiftowlim:Sail" ;
owlim:ruleset "owl-max" ;
owlim:partialRDFS "true" ;
owlim:noPersist "false" ;
owlim:storage-folder "odnamar-storage" ;
owlim:base-URL "http://www.fao.org/aims/aos/agrovoc#"; ;
owlim:new-triples-file "new-triples-file.nt" ;
owlim:entity-index-size "200000" ;
owlim:jobsize "200" ;
owlim:repository-type "in-memory-repository" ;
owlim:imports "./src/main/resources/ontologies/
owl.rdfs;" ;
owlim:defaultNS "http://www.w3.org/2002/07/owl#;";
]
].
From: Armando Stellato [mailto:stell...@info.uniroma2.it]
Sent: Saturday, September 05, 2009 6:35 PM
To: 'owlim-discussion@ontotext.com'
Subject: directsubclass bug?
Hi all,
Loaded an empty repository, asked for triples with predicate
SESAME:DIRECTSUBCLASSOF and got a lot of triples like:
X SESAME:DIRECTSUBCLASSOF X
While direct sub class semantics (from its javadoc) clearly states:
Class A is a direct subclass of B iff:
1. A is a subclass of B and;
2. A and B are not equa and;
3. there is no class C (unequal A and B) such that
A is a subclass of C and C of B.
So this seems to clash with condition 2.
Is it a bug in owlim?
Armando
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